The ground state of Ce

3+

is 4f

1

5d

0

which have only one 4f electron on the configuration.For this reason

the excitation spectrum of Ce

3+

ion directly shows the energy state of 5d level.Ce

3+

ion can be used as a probe to investigate the f-d transitions of other rare-earth ions in same host lattice sites

since the similarity of the crystal-field effect on the 5d states of different rare earth ions in the sites.The phosphor

Ce

3+

ion activated tetra-borate SrB

4

O

7

was prepared by high temperature solidstate reaction technique in present paper.Na

+

ion was added to balance the electronic charge due to the different electronic charge value between Ce

3+

and Sr

2+

ions.The XRDpatterns of the sample Sr

0.96

Ce

0.02

Na

0.02

B

4

O

7

are in good line with the JCPDS standard card 15-801(SrB

4

O

7

).The VUV(vacuum ultraviolet) excitation and emission spectra were measured at the VUVspectroscopy experimental station on beam line 3B1B

Beijing Synchrotron Radiation Facilities(BSRF)

under normal operating conditions(2.2 GeV

100 mA) at 293 K.The spectroscopic properties of this phosphor are investigated in the wavelength region 130~400 nm.The host-related Absorption is found to be about 155 nm.The five bands corresponding to the 4f

1

→4f

0

5d

1

transitions of Ce

3+

ions are identified as 277

242

228

217 and 202 nm in the host lattices.Therefore

the 5d crystal field splitting and the barycenter of Ce

3+

in the host lattice are calculated to be 13.4×10

3

and 43.4×10

3

cm

-1

respectively.The doublet emission bands of Ce

3+

in the host lattice are observed at 293 and 313 nm.Hence

the Stokes shift is 1971cm

-1

.Because SrB

4

O

7

and SrBPO

5

share iso-structural characteristics: the cations are same

and all of anions are tetrahedral AO

4

(

A

=B

P).The spectroscopic properties of Ce

3+

in these host lattices are compared and discussed qualitatively.